18653749 has 2 divisors, whose sum is σ = 18653750. Its totient is φ = 18653748.

The previous prime is 18653737. The next prime is 18653753. The reversal of 18653749 is 94735681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12552849 + 6100900 = 3543^2 + 2470^2 .

It is a cyclic number.

It is not a de Polignac number, because 18653749 - 2¹¹ = 18651701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18653149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9326874 + 9326875.

It is an arithmetic number, because the mean of its divisors is an integer number (9326875).

Almost surely, 2^18653749 is an apocalyptic number.

It is an amenable number.

18653749 is a deficient number, since it is larger than the sum of its proper divisors (1).

18653749 is an equidigital number, since it uses as much as digits as its factorization.

18653749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 181440, while the sum is 43.

The square root of 18653749 is about 4318.9986107893. The cubic root of 18653749 is about 265.2092757695.

It can be divided in two parts, 186 and 53749, that added together give a palindrome (53935).

The spelling of 18653749 in words is "eighteen million, six hundred fifty-three thousand, seven hundred forty-nine".